/*
* libudev - interface to udev device information
*
- * Copyright (C) 2004-2009 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
-#include <sys/wait.h>
#include <sys/param.h>
#include "libudev.h"
#include "libudev-private.h"
-int util_create_path(struct udev *udev, const char *path)
+static int create_path(struct udev *udev, const char *path, bool selinux)
{
char p[UTIL_PATH_SIZE];
char *pos;
struct stat stats;
- int ret;
+ int err;
util_strscpy(p, sizeof(p), path);
pos = strrchr(p, '/');
- if (pos == p || pos == NULL)
+ if (pos == NULL)
return 0;
-
- while (pos[-1] == '/')
+ while (pos != p && pos[-1] == '/')
pos--;
+ if (pos == p)
+ return 0;
pos[0] = '\0';
dbg(udev, "stat '%s'\n", p);
- if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
- return 0;
+ if (stat(p, &stats) == 0) {
+ if ((stats.st_mode & S_IFMT) == S_IFDIR)
+ return 0;
+ else
+ return -ENOTDIR;
+ }
- if (util_create_path(udev, p) != 0)
- return -1;
+ err = util_create_path(udev, p);
+ if (err != 0)
+ return err;
dbg(udev, "mkdir '%s'\n", p);
- udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
- ret = mkdir(p, 0755);
- udev_selinux_resetfscreatecon(udev);
- if (ret == 0)
- return 0;
+ if (selinux)
+ udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
+ err = mkdir(p, 0755);
+ if (err != 0) {
+ err = -errno;
+ if (err == -EEXIST && stat(p, &stats) == 0) {
+ if ((stats.st_mode & S_IFMT) == S_IFDIR)
+ err = 0;
+ else
+ err = -ENOTDIR;
+ }
+ }
+ if (selinux)
+ udev_selinux_resetfscreatecon(udev);
+ return err;
+}
- if (errno == EEXIST)
- if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
- return 0;
- return -1;
+int util_create_path(struct udev *udev, const char *path)
+{
+ return create_path(udev, path, false);
+}
+
+int util_create_path_selinux(struct udev *udev, const char *path)
+{
+ return create_path(udev, path, true);
}
int util_delete_path(struct udev *udev, const char *path)
{
char p[UTIL_PATH_SIZE];
char *pos;
- int retval;
+ int err = 0;
- strcpy (p, path);
+ if (path[0] == '/')
+ while(path[1] == '/')
+ path++;
+ util_strscpy(p, sizeof(p), path);
pos = strrchr(p, '/');
if (pos == p || pos == NULL)
return 0;
- while (1) {
+ for (;;) {
*pos = '\0';
pos = strrchr(p, '/');
if ((pos == p) || (pos == NULL))
break;
- /* remove if empty */
- retval = rmdir(p);
- if (errno == ENOENT)
- retval = 0;
- if (retval) {
- if (errno == ENOTEMPTY)
- return 0;
- err(udev, "rmdir(%s) failed: %m\n", p);
+ err = rmdir(p);
+ if (err < 0) {
+ if (errno == ENOENT)
+ err = 0;
break;
}
- dbg(udev, "removed '%s'\n", p);
}
- return 0;
-}
-
-/* Reset permissions on the device node, before unlinking it to make sure,
- * that permisions of possible hard links will be removed too.
- */
-int util_unlink_secure(struct udev *udev, const char *filename)
-{
- int retval;
-
- retval = chown(filename, 0, 0);
- if (retval)
- err(udev, "chown(%s, 0, 0) failed: %m\n", filename);
-
- retval = chmod(filename, 0000);
- if (retval)
- err(udev, "chmod(%s, 0000) failed: %m\n", filename);
-
- retval = unlink(filename);
- if (errno == ENOENT)
- retval = 0;
-
- if (retval)
- err(udev, "unlink(%s) failed: %m\n", filename);
-
- return retval;
+ return err;
}
uid_t util_lookup_user(struct udev *udev, const char *user)
{
char *endptr;
- int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
char buf[buflen];
struct passwd pwbuf;
struct passwd *pw;
if (endptr[0] == '\0')
return uid;
- errno = 0;
- getpwnam_r(user, &pwbuf, buf, buflen, &pw);
+ errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw);
if (pw != NULL)
return pw->pw_uid;
if (errno == 0 || errno == ENOENT || errno == ESRCH)
gid_t util_lookup_group(struct udev *udev, const char *group)
{
char *endptr;
- int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
- char buf[buflen];
+ size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ char *buf;
struct group grbuf;
struct group *gr;
gid_t gid = 0;
gid = strtoul(group, &endptr, 10);
if (endptr[0] == '\0')
return gid;
+ buf = NULL;
+ gid = 0;
+ for (;;) {
+ char *newbuf;
- errno = 0;
- getgrnam_r(group, &grbuf, buf, buflen, &gr);
- if (gr != NULL)
- return gr->gr_gid;
- if (errno == 0 || errno == ENOENT || errno == ESRCH)
- err(udev, "specified group '%s' unknown\n", group);
- else
- err(udev, "error resolving group '%s': %m\n", group);
- return 0;
+ newbuf = realloc(buf, buflen);
+ if (!newbuf)
+ break;
+ buf = newbuf;
+ errno = getgrnam_r(group, &grbuf, buf, buflen, &gr);
+ if (gr != NULL) {
+ gid = gr->gr_gid;
+ } else if (errno == ERANGE) {
+ buflen *= 2;
+ continue;
+ } else if (errno == 0 || errno == ENOENT || errno == ESRCH) {
+ err(udev, "specified group '%s' unknown\n", group);
+ } else {
+ err(udev, "error resolving group '%s': %m\n", group);
+ }
+ break;
+ }
+ free(buf);
+ return gid;
}
/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
udev_device_unref(dev);
return 0;
}
-
-int util_run_program(struct udev *udev, const char *command, char **envp,
- char *result, size_t ressize, size_t *reslen)
-{
- int status;
- int outpipe[2] = {-1, -1};
- int errpipe[2] = {-1, -1};
- pid_t pid;
- char arg[UTIL_PATH_SIZE];
- char program[UTIL_PATH_SIZE];
- char *argv[(sizeof(arg) / 2) + 1];
- int devnull;
- int i;
- int err = 0;
-
- info(udev, "'%s' started\n", command);
-
- /* build argv from command */
- util_strscpy(arg, sizeof(arg), command);
- i = 0;
- if (strchr(arg, ' ') != NULL) {
- char *pos = arg;
-
- while (pos != NULL && pos[0] != '\0') {
- if (pos[0] == '\'') {
- /* do not separate quotes */
- pos++;
- argv[i] = strsep(&pos, "\'");
- while (pos != NULL && pos[0] == ' ')
- pos++;
- } else {
- argv[i] = strsep(&pos, " ");
- }
- dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
- i++;
- }
- argv[i] = NULL;
- } else {
- argv[0] = arg;
- argv[1] = NULL;
- }
-
- /* prepare pipes from child to parent */
- if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
- if (pipe(outpipe) != 0) {
- err(udev, "pipe failed: %m\n");
- return -1;
- }
- }
- if (udev_get_log_priority(udev) >= LOG_INFO) {
- if (pipe(errpipe) != 0) {
- err(udev, "pipe failed: %m\n");
- return -1;
- }
- }
-
- /* allow programs in /lib/udev/ to be called without the path */
- if (argv[0][0] != '/') {
- util_strscpyl(program, sizeof(program), LIBEXECDIR "/", argv[0], NULL);
- argv[0] = program;
- }
-
- pid = fork();
- switch(pid) {
- case 0:
- /* child closes parent ends of pipes */
- if (outpipe[READ_END] > 0)
- close(outpipe[READ_END]);
- if (errpipe[READ_END] > 0)
- close(errpipe[READ_END]);
-
- /* discard child output or connect to pipe */
- devnull = open("/dev/null", O_RDWR);
- if (devnull > 0) {
- dup2(devnull, STDIN_FILENO);
- if (outpipe[WRITE_END] < 0)
- dup2(devnull, STDOUT_FILENO);
- if (errpipe[WRITE_END] < 0)
- dup2(devnull, STDERR_FILENO);
- close(devnull);
- } else
- err(udev, "open /dev/null failed: %m\n");
- if (outpipe[WRITE_END] > 0) {
- dup2(outpipe[WRITE_END], STDOUT_FILENO);
- close(outpipe[WRITE_END]);
- }
- if (errpipe[WRITE_END] > 0) {
- dup2(errpipe[WRITE_END], STDERR_FILENO);
- close(errpipe[WRITE_END]);
- }
- execve(argv[0], argv, envp);
- if (errno == ENOENT || errno == ENOTDIR) {
- /* may be on a filesytem which is not mounted right now */
- info(udev, "program '%s' not found\n", argv[0]);
- } else {
- /* other problems */
- err(udev, "exec of program '%s' failed\n", argv[0]);
- }
- _exit(1);
- case -1:
- err(udev, "fork of '%s' failed: %m\n", argv[0]);
- return -1;
- default:
- /* read from child if requested */
- if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
- ssize_t count;
- size_t respos = 0;
-
- /* parent closes child ends of pipes */
- if (outpipe[WRITE_END] > 0)
- close(outpipe[WRITE_END]);
- if (errpipe[WRITE_END] > 0)
- close(errpipe[WRITE_END]);
-
- /* read child output */
- while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
- int fdcount;
- fd_set readfds;
-
- FD_ZERO(&readfds);
- if (outpipe[READ_END] > 0)
- FD_SET(outpipe[READ_END], &readfds);
- if (errpipe[READ_END] > 0)
- FD_SET(errpipe[READ_END], &readfds);
- fdcount = select(MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
- if (fdcount < 0) {
- if (errno == EINTR)
- continue;
- err = -1;
- break;
- }
-
- /* get stdout */
- if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
- char inbuf[1024];
- char *pos;
- char *line;
-
- count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
- if (count <= 0) {
- close(outpipe[READ_END]);
- outpipe[READ_END] = -1;
- if (count < 0) {
- err(udev, "stdin read failed: %m\n");
- err = -1;
- }
- continue;
- }
- inbuf[count] = '\0';
-
- /* store result for rule processing */
- if (result) {
- if (respos + count < ressize) {
- memcpy(&result[respos], inbuf, count);
- respos += count;
- } else {
- err(udev, "ressize %ld too short\n", (long)ressize);
- err = -1;
- }
- }
- pos = inbuf;
- while ((line = strsep(&pos, "\n")))
- if (pos || line[0] != '\0')
- info(udev, "'%s' (stdout) '%s'\n", argv[0], line);
- }
-
- /* get stderr */
- if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
- char errbuf[1024];
- char *pos;
- char *line;
-
- count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
- if (count <= 0) {
- close(errpipe[READ_END]);
- errpipe[READ_END] = -1;
- if (count < 0)
- err(udev, "stderr read failed: %m\n");
- continue;
- }
- errbuf[count] = '\0';
- pos = errbuf;
- while ((line = strsep(&pos, "\n")))
- if (pos || line[0] != '\0')
- info(udev, "'%s' (stderr) '%s'\n", argv[0], line);
- }
- }
- if (outpipe[READ_END] > 0)
- close(outpipe[READ_END]);
- if (errpipe[READ_END] > 0)
- close(errpipe[READ_END]);
-
- /* return the childs stdout string */
- if (result) {
- result[respos] = '\0';
- dbg(udev, "result='%s'\n", result);
- if (reslen)
- *reslen = respos;
- }
- }
- waitpid(pid, &status, 0);
- if (WIFEXITED(status)) {
- info(udev, "'%s' returned with exitcode %i\n", command, WEXITSTATUS(status));
- if (WEXITSTATUS(status) != 0)
- err = -1;
- } else {
- err(udev, "'%s' unexpected exit with status 0x%04x\n", command, status);
- err = -1;
- }
- }
- return err;
-}
~ianmdlvl / elogind.git / blobdiff